Update article.md

1-js/02-first-steps/04-variables/article.md

@@ -24,7 +24,7 @@ Now, we can put some data into it by using the assignment operator `=`:
 let message;
 
 *!*
-message = 'Hello'; // store the string
+message = 'Hello'; // store the string 'Hello' in the variable named message
 */!*
 ```